EP 3540128 A1 20190918 - HYDRAULIC CONTROL SYSTEM FOR CONSTRUCTION MACHINE
Title (en)
HYDRAULIC CONTROL SYSTEM FOR CONSTRUCTION MACHINE
Title (de)
HYDRAULIKSTEUERUNGSSYSTEM FÜR BAUMASCHINE
Title (fr)
SYSTÈME DE COMMANDE HYDRAULIQUE POUR ENGIN DE CHANTIER
Publication
Application
Priority
KR 2016012543 W 20161102
Abstract (en)
The present invention relates to a hydraulic control system for a construction machine. More specifically, the present invention provides a hydraulic control system for a construction machine comprising: a hydraulic pump group that includes a first hydraulic pump, a second hydraulic pump and a third hydraulic pump; a main control valve (MCV) that includes a first spool group that controls the amount and the flow of pressurised fluid supplied from the first hydraulic pump and the second hydraulic pump and that includes an operation apparatus spool, a driving spool and a merging spool, a second spool group that controls the amount and the flow of pressurised fluid supplied from the third hydraulic pump and that includes a rotating spool, and a straight driving valve that is installed between the first spool group and the second spool group; a first pilot signal line that is connected to the operation apparatus spool and that provides a supply path for a pilot pressurised fluid that is applied in order to switch the operation apparatus spool; a second pilot signal line that is connected to the driving spool and that provides a supply path for a pilot pressurised fluid that is applied in order to switch the driving spool; and a direction changing valve that is installed on the second pilot signal line connecting the driving spool and a tank, that is connected to the first pilot signal line, and that is switched when the operation apparatus spool is switched so as to cut off the flow of a pilot pressurised fluid that is returning to the tank.
IPC 8 full level
E02F 9/22 (2006.01); F15B 11/16 (2006.01)
CPC (source: EP US)
E02F 9/2242 (2013.01 - EP); E02F 9/2267 (2013.01 - US); E02F 9/2285 (2013.01 - EP US); E02F 9/2292 (2013.01 - EP US); F15B 11/10 (2013.01 - US); F15B 11/166 (2013.01 - US); F15B 11/17 (2013.01 - EP US); F15B 13/0402 (2013.01 - US); F15B 13/043 (2013.01 - US); F15B 2211/20576 (2013.01 - EP US); F15B 2211/30595 (2013.01 - EP); F15B 2211/329 (2013.01 - EP); F15B 2211/355 (2013.01 - EP); F15B 2211/40576 (2013.01 - US); F15B 2211/428 (2013.01 - US); F15B 2211/6355 (2013.01 - EP US); F15B 2211/67 (2013.01 - EP); F15B 2211/7135 (2013.01 - EP); F15B 2211/7142 (2013.01 - EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3540128 A1 20190918; EP 3540128 A4 20201216; EP 3540128 B1 20220309; CN 110226010 A 20190910; CN 110226010 B 20220412; US 10767668 B2 20200908; US 2019330824 A1 20191031; WO 2018084332 A1 20180511
DOCDB simple family (application)
EP 16920594 A 20161102; CN 201680090448 A 20161102; KR 2016012543 W 20161102; US 201616346765 A 20161102